No problems with steel base other than harder to size in my loader. I never had trouble finding regular AA hulls for free so wasn't worth my trouble fighting the Super Targets in my Pacific 366. I've also heard that steel base hulls can be a little rougher on your gun. I do not know if that is true though.
Lyman says use AA data for Win polyformed hull/ steel base.
I have no issues tossing after once or twice because of the thickness of the poly the same as I do with estates and top guns. A few thousand I am sure of the super targets. Love"em for doubles and just let them fly.